<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
        show-icon
      ></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row>
        <el-col class="cat_opt">
          <span>商品分类区域:</span>
          <el-cascader
            v-model="selectedcatekeys"
            :options="CateList"
            :props="Cateprops"
            expand-trigger="hover"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tabs页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnisabled"
            @click="addmanyData"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manytableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>

            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  @click="eidtdiglog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeparmas(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnisabled"
            @click="addmanyData"
            >添加属性</el-button
          >
          <!-- 静态参数表格 -->
          <el-table :data="onlytableData" border stripe>
            <!-- 展开行 -->
             <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>

            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  @click="eidtdiglog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeparmas(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="adddatadialogVisible"
      width="50%"
      @close="clearadddialog"
    >
      <!-- 添加动态参数的form表单 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="adddatadialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addparmas">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editdatadialogVisible"
      width="50%"
      @close="cleareditdialog"
    >
      <!-- 添加动态参数的form表单 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editdatadialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editparmas">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //商品列表数据
      CateList: [],
      //级联选择器的配置项
      Cateprops: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //级联选择框双向绑定数组
      selectedcatekeys: [],
      //被激活的页签名称
      activeName: "many",
      //获取到的动态参数数据
      manytableData: [],
      //获取到的静态参数数据
      onlytableData: [],
      //添加动态参数的对话框的显示与隐藏
      adddatadialogVisible: false,
      //添加参数表单的数据对象
      addForm: {
        attr_name: "",
      },
      //添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称",
            trigger: "blur",
          },
        ],
      },
      //修改对话框的显示与隐藏
      editdatadialogVisible: false,
      //修改参数的数据对象
      editForm: {},
      //修改参数的验证规则对象
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称",
            trigger: "blur",
          },
        ],
      },
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品列表失败");
      }
      this.CateList = res.data;
      //   console.log(this.CateList);
    },
    //级联选择框变化会触发这个函数
    handleChange() {
      this.getparamsData();
    },
    //tabs页签点击事件的处理函数
    handleTabClick() {
      //   console.log(this.activeName);
      this.getparamsData();
    },
    async getparamsData() {
      //证明选中的不是三级分类
      if (this.selectedcatekeys.length !== 3) {
        this.selectedcatekeys = [];
        this.manytableData = [];
        this.onlytableData = [];
        return;
      }
      //证明选中的是三级分类
      //   console.log(this.selectedcatekeys);
      //根据所选分类的ID，和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateid}/attributes`,
        { params: { sel: this.activeName } }
      );
      if (res.meta.status !== 200) {
        this.$message.error("获取参数列表失败");
      }
      //循环分割字符串拿到attr_vals
      res.data.forEach((item) => {
        //三元运算符处理空字符串bug
        item.attr_vals = item.attr_vals
          ? item.attr_vals.split(" ")
          : (item.attr_vals = []);
        //控制文本框的显示与隐藏
        item.inputVisible = false;
        //文本输入框的值
        item.inputValue = "";
      });
      // console.log(res.data);
      if (this.activeName === "many") {
        this.manytableData = res.data;
      } else {
        this.onlytableData = res.data;
      }
    },
    //添加动态参数的按钮
    addmanyData() {
      this.adddatadialogVisible = true;
    },
    //清空添加对话框
    clearadddialog() {
      this.$refs.addFormRef.resetFields();
    },
    //点击按钮，添加参数
    addparmas() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateid}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 201) {
          return this.$message.error("添加参数失败");
        }
        this.$message.success("添加参数成功");
        this.getparamsData();
        this.adddatadialogVisible = false;
      });
    },
    //清空点击对话框
    cleareditdialog() {
      this.$refs.editFormRef.resetFields();
    },
    //点击编辑，编辑参数
    async eidtdiglog(attr_id) {
      //查询当前参数的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateid}/attributes/${attr_id}`,
        {
          params: {
            attr_sel: this.activeName,
          },
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取数据失败");
      }
      this.editForm = res.data;
      this.editdatadialogVisible = true;
    },
    //点击编辑完成
    editparmas() {
      this.$refs.editFormRef.validate(async (vali) => {
        if (!vali) return;
        const { data: res } = await this.$http.put(
          `categories/${this.cateid}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("修改数据失败");
        }
        this.$message.success("修改数据成功");
        this.getparamsData();
        this.editdatadialogVisible = false;
      });
    },
    //删除操作
    async removeparmas(attr_id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该属性, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除");
      }
      const { data: res } = await this.$http.delete(
        `categories/${this.cateid}/attributes/${attr_id}`
      );
      if (res.meta.status !== 200) {
        return this.$message.error("删除失败");
      }
      this.getparamsData();
    },
    //文本框失去了焦点或按下了Enter都会触发函数
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }
      //如果没有return ,则证明输入的内容有效，再做后继处理
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;
      this.saveattrvalue(row);
    },
    //显示文本框
    showInput(row) {
      row.inputVisible = true;
      //文本框自动获得焦点
      //$nextTick 的方法与作用，就是当页面上的元素被重新渲染之后，
      //才会指定回调函数中的代码
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    //删除对应项的参数
    handleClose(i, row) {
      row.attr_vals.splice(i, 1);
      this.saveattrvalue(row);
    },
    //对attr_vals的操作保存到数据库
    async saveattrvalue(row) {
      //需要发起请求，保存这次操作
      const { data: res } = await this.$http.put(
        `categories/${this.cateid}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(" "),
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("修改数据失败");
      }
      this.$message.success("修改数据成功");
    },
  },
  computed: {
    //如果级联选择框没有被选中   无法选中button按钮
    isBtnisabled() {
      if (this.selectedcatekeys.length !== 3) {
        return true;
      }
      return false;
    },
    cateid() {
      if (this.selectedcatekeys.length === 3) {
        return this.selectedcatekeys[2];
      }
      return null;
    },
    //动态绑定title
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      } else {
        return "静态属性";
      }
    },
  },
};
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 5px 10px;
}
.input-new-tag {
  width: 120px;
}
</style>